Cutter-head for irbegttlar forms



UNITED STATES 'PATEN T OFFICE.

DANIEL DNLAP, OF CONCORD, NEW HAMPSHIRE.

CUTTER-HEAD FOR IRREG-ULAR FORMS.

To all whom t may concern.'

Be it known that I, DANIEL DUNLAP, of Concord, in the county of Merrimack and State of New Hampshire, have invented an Improved Machine for Turning or Cutting Irregular Forms from a Pattern; and I do hereby declare that the same is fully described and represented in the following specification and the accompanying drawings, letters, figures, and references thereof.

In such drawings the said machine is exhibited in side elevation in Figure l; in vertical and longitudinal section in Fig. 2; in horizontal and transverse in Fig. 3, and in top view in Fig. 4; Fig. 5 is a side view of one of its knives.

The machine herein described in some respects is similar to that for which Letters Patent were granted on the 8th day of November, A. D. 1853, to Nathan Geer, it being intended for producing the same kind of work as is performed by the machine of the said Geer.

In a vertical shaft A, a cylindrical formen guide or head B, is fixed concentrically the shaft being extended through it and provided with a male screw as seen at G, and I, in the drawings. Another cylindrie head, C, is also placed on the shaft and has between it and the former two gages D, D, each of which is crescent shaped and has its external surface arranged in a circle which is not only concentric with the axis of the shaft- A, but of a radius a little less than that of the guide head, B. A screw nut, I-I, serves to confine the parts B, C, D, D, upon the shaft A.

Between the two heads B, C, the part, G, of the shaft A, and each of the guides, D, there is arranged a curved cutter, E, whose upper edges are beveled or chamfered as seen at, a, a, in Figs. 2, and 5, the head being formed angular or with an inclined recess h, (as seen in Fig. 2) for the reception of the lower end of the cutter. Against the upper chamfer of the cutter conical ends of screws, c, c, are forced when such screws are moved downward, the said screws being applied to the upper head C. It is not intended that the extreme point of the lower end of each of said screws shall rest against the upper end of the cutter, E, but only that the side of the conical end shall bear against it as exhibited in Fig. 2, such in connection with the beveled surfaces a, a, b serving not only to press the cutter longitudinally against the -head E, but to force it laterally and closely against the inner curved surface of the gage D, whereby, by the peculiar form of such gage on its inner surface, recession of the cutter while it is in operation is sufficiently prevented for all practical purposes. The external curved surface of each part D serves while the cutter is in rotation and the pattern is forced against the guide head D, to so regulate the action of the knife as not only to prevent it from cut-ting too deeply into the wood, but to cause it to reduce the wood by successive small cuts or shavings.

It is found, that when the knife has no curved gage applied to it to regulate its depth of cut, it is apt sometimes and especially when working on cross grained stuff to either tear out large portions of t-he wood or to so catch in the same as to throw it or it and the pattern out of place or its proper position. The importance. of preventing the cutter from taking too rank a hold on the wood will thus be seen, The curved form of the inner surface of each cutter serves to facilitate the passage of the chip through the mouth F,

In operating with the machine, the wood to be reduced is fixed to a pattern bar, which is borne and moved lengthwise against the guide head, B, which regulates the approach of the wood toward the knives, while their advance into it is governed by the curved gage D, applied to each.

By applying the gages, D, D, to the guide B, the pressure of the pattern against the guide is not required to be near so great as when the knives have no such gages. Consequently not only is wear of the pattern diminished, but the friction of it against the head, B, reduced, such friction operating to increase the power required to rotate the shaft A. The application of the gage to the pattern head or guide B, is therefore a matter of great value in the machine.

I do not claim merely applying to a plane iron a cont-rivance to gage its depth of cut; nor do I claim the combination of knives in any manner with a rotary cutter head, so that said head shall serve as a guide or directrix to the form or pattern carrying the material to be dressed; but

What I claim is- 1. Combining with or arranging in connection with the rotary guide B, and each of its knives in manner as described, the cyf lindric crescent gage, D, whereby, while the they are not only held in such direction, but Y at the same time are pressed laterally against the curved inner faces of the gages D, D, in manner and for the purpose as specified.

In testimony whereof I have hereunto set my signature this twenty-second dayv of 15 June, A. D. 1855.

DANIEL DUNLAP.

Witnesses:

ASA FoWLER, W. H. MCCARTNEY, E. W. JACKSON. 

